class Mammalia vs mammalian

class Mammalia and mammalian both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Mammalia	Yes	No	No	No
mammalian	Yes	Yes	No	No

class Mammalia (noun)	mammalian (noun)
warm-blooded vertebrates characterized by mammary glands in the female	any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk

class Mammalia (adjective)	mammalian (adjective)
	of or relating to the class Mammalia